1. The minimum audible wavelength at room
temperature is about
a) \[0.2 \dot{A}\]
b) \[5 \dot{A}\]
c) 5 cm to 2 metre
d) 20 mm
Explanation:
2. The ratio of the speed of sound in nitrogen gas to
that in helium gas, at 300 K is
a) \[\sqrt{2/7}\]
b) \[\sqrt{1/7}\]
c) \[\sqrt{3}/5\]
d) \[\sqrt{6}/5\]
Explanation:
3.In a sinusoidal wave, the time required for a
particular point to move from maximum
displacement to zero displacement is 0.170
second. The frequency of the wave is
a) 1.47 Hz
b) 0.36 Hz
c) 0.73 Hz
d) 2.94 Hz
Explanation:
4. The number of waves contained in unit length of
the medium is called
a) Elastic wave
b) Wave number
c) Wave pulse
d) Electromagnetic
wave
Explanation:
5. The frequency of a rod is 200 Hz. If the velocity of
sound in air is 340 m \[s^{-1}\] , the wavelength of the
sound produced is
a) 1.7 cm
b) 6.8 cm
c) 1.7 m
d) 6.8 m
Explanation:
6. Frequency range of the audible sounds is
a) 0 Hz – 30 Hz
b) 20 Hz – 20 kHz
c) 20 kHz – 20,000 kHz
d) 20 kHz – 20 MHz
Explanation: 20 Hz – 20 kHz
7. In a medium sound travels 2 km in 3 sec and in
air, it travels 3 km in 10 sec. The ratio of the
wavelengths of sound in the two media is
a) 1 : 8
b) 1 : 18
c) 8 : 1
d) 20 : 9
Explanation:
8.A stone is dropped into a lake from a tower 500
metre high. The sound of the splash will be heard
by the man approximately after
a)11.5 seconds
b) 21 seconds
c) 10 seconds
d) 14 seconds
Explanation:
9.When sound waves travel from air to water,
which of the following remains constant
a) Velocity
b) Frequency
c) Wavelength
d) All the above
Explanation: When medium changes, velocity and wavelength changes but frequency remains constant.
10. A stone is dropped in a well which is 19.6m deep.
Echo sound is heard after 2.06 sec (after
dropping) then the velocity of sound is
a) 332.6 m/sec
b) 326.7 m/sec
c) 300.4 m/sec
d) 290.5 m/sec
Explanation:
